Incandescent lamp.



B. D. TIFFANY.

INUANDESCENT LAMP.

APPLICATION rum) AUG. 27, 1908.-

Patented Nov. 30, 1909.

1 9 1 rue/awn ROSS I). TIFFANY, 0F BELLIN'GH-Alvi, TWASHINGTON.

INCANDESCENT LAMP.

conc se,

Specification of Letters Patent.

recesses Nov. so, ices.

Application filed August 27, 1908. Serial no. 459,434.

To all whom it may concern:

lie it known that. 1, Ross D. TIFFANY, a citizen of the United States, residing at Bellinghuin, in the county of Whatcom, State of Vl'ushington, have invented certain new and useful Improvements in Incandescent Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it upper-thins to make and use the. same.

This invention relates to incsndescent lumps, and more particularly one provided with a plurality of filaments, and means whereby any number thereof may be thrown into circuit to vur the intensity of the light.

The object of the invention is to provide the usual globe or bulb with a plurality of looped filaments each. connected intermediate their ends to a conductor located within the globe and provided at their ends with contacts; One of the leading-in wires is con nectedto the aforesaid conductor, and the other lending-in wire is connected to a, lnoveblecontact-member which is adapted to successively engage the contacts of the filamentswhercby any number of the latter may bethroWninto circuit.

A further obect of the invention is to provide clamp 0 this kind which is simple in structure end which can be eesilyinunipw hated to produce the desired intensity of In. the accompanying drawings, Figure l is u vertical section through-the lamp casing. Fig. 2 is a perspective View of the upper glut of the bulb and the parts curried therey. Fig. 3 is usectionsl detail. Fig. ise

bottom plan view of one of the members hereinafter referred to Referring more particularly to the drawings, 5 denotes a bulb or globe-of on incsnv descent lamp which is sealed and provided with a. screw-sleeve 6, as usual; The bulb "contains a pluru'lit of looped filaments 7 which are connecte intermediate their ends to u. conductor 8, of fine co oper wire depending into the bulb. The cnosof the filaments are embedded in the seal as usual, and on the outside thereof, each of said ends is connected to a Contact 9. The conductortl also extends through the seal, end on the outside thereof, is connected to a metallic disls 10.

At 11 is indicated e cylindrical block of insulatin material hevin. at its lower ends a reduce portion 12 to t e end of which is secured a metallic plate 13. To the lower end of the block 11, and surrounding the part 12, is secured a ring 14 which is pro vidcd near its outer edge with a number of regularly spaced holes 15, which are for a urpose to be presently described. The ring is fastened to the block by means of lugs 16 embedded therein. From the ring gbi'ojects u segmental sleeve 17 whichforms a movable contact-member adapted to engage the contactsv 9 as will be explained hereinafter. The block. 11 is provided with binding screv s 18 and 19, respectively, whereby connection is made with the leading-in wires. The

is electrically obnworks a stem 21 connected'toa toothed screw 18 is in electrical connection with the' and in its upper edge is a notch inc wheel 22 whichis engageable with the'holes 15 of the ring 14. The outer end of the stem 21 is fitted with a finger piece 23 of suitable. insulating material.

The upper part of the block 11 is inclosed by a cap 2 which is removably connected to the sleeve 20 by a pin 25 and bayonet slot 26. In the top of this cap is an opening through which the leading-in wires ing screws Y18 and 19, sci lined'with u bushing terial.

To assemble the ports, the block 11 is placed Within the sleevc'20 and cap 24, and said sleeve and cap are then coupled to gether by the pin 25 and bayonet slot 26. The bulb is then screwed into the sleeve 20 of insulating mauntil the disk 10 is in contact with the plate 13, whereby the conductor 8 is connected to one of the leading-in wires With the parts in this position, the block 11 is free to rotate in the sleeve 20 and the cop 24, and the sleeve 17 engagestbe co'ntsctsl) when it is brought above the same, whichis done by rotating the block it by on the ring" is. 'llhobloclr, 11 adjacent the wheel i-s'cut sway as indicated at 528 andthat portion of the it which is provided with the holes 15 projects therefrom so that the toothed wheel gaging the sleeve 17 with two or more of the contacts 5%, no corresponding number of file.-

incsns of the toothed wheel 22 22 may engage with said, holes. 'Upon rotut'ing the block 11 and enass to the bindopening being' mant s will be: thtrown into circuit and the in merit-contacts are arranged tensity of the light is thus regulated. \Vhen the sleeve is disengaged from all the contacts, all the fildments will be cut out. The filatp: pairs the members of each pair being located adjacent to each other, as sho wn in Fig. 2 so that when the first pair of contacts is engaged by the sleeve 17 one filament Will be in circuit. When the next pair of contacts is engaged by'the sleeve another filament will be in circuit, and so on until all the filaments are in circuit. Four filaments are shown, but their number is' immaterial and may be varied to suit the demands of the trade. If desired only one side of a filament may be thrown in circuit by engaging the contact 17 with the first one'of the contacts 9.

The current may be traced from one of the leading-in wires to the binding screw 18, thence to the lugs 16, ring 14, sleeve 17, the contacts 9, filaments'T, conductor 8, disk 10,

plate 13, and then to the binding screw 1.9

and to the other leadingsin wire;

' What is claimed is:

1. A socket for incandescent lamps which have a multlplicity of filaments, comprising a casing, an insulating element rotatably held in said casing, a central contact, a conductor plate on the end of said insulating element provided with gear engaging means,

an arcuate flange on said plate to form a multiple contact, a gear in said socket engaging the means on the plate to rotate said plate and element, means exterior of the socket to rotate the gear, and conductor .wires connected-to said plate and the central contact of the socket.

2. The co1nbinatio1iwith an il'lcandescent lamp having a plurality of filaments, a wire connected to each of said filaments, and a I base provided with a centrally disposed con-. tact connected to said wire and a contact point for and connected to each of said filaments; of a socket, an insulating element rotatably held in said socket, a central con- ED E. HARDIN,

J. W. Rosa. 

